Facebook Inc. is grappling with another challenge to how it does business, with German regulators cracking down on the tech giant's efforts to combine user data from across the internet into their Facebook accounts.

Alphabet is often criticized as a black box, revealing as little as possible about its plans and confusing investors in the process. Opacity isn't unique to Alphabet, but it can pose a problem for investors in high-growth tech stocks.

Global stocks edged higher again Tuesday in quiet overnight trading, lifting the broadest measure of world stocks to the highest level in two months, as investors continue to favor the robust U.S. economic data over concerns for the fate of trade talks with Beijing.